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Piloted by [[penitent]]s, heretics previously guilty of terrible crimes, this is amongst the worst imaginable punishments available to the [[Imperium]]. A multitude of wires and , chemical injectors , and pain-nodes are implanted into the heretic's spineand body, which are then attached to a the mechanical suit . The pilot is suspended amidst the gears and electro-shackles, with their arms clamped wide and locked into the mechanisms of the Engine’s giant weapon-limbs.{{Fn|7b}} A key component of the Penitent Engine is the '''Excruciatum Locus''', a parasitic pain regulation device, originally of [[Nostramo|Nostraman]] design, lodged directly into the pilot's thalamus. This device delivers artificial pain signals at least two orders of destructionmagnitude higher than can be achieved through physical infliction, magnifying the pilot's frenzied behaviour in combat without causing physiological harm. {{Fn|6}} When outside of combat, chemical implants inject feelings of guilt and pain directly into their brains, reminding them of their sins. Driven by their pilot's frantic need for forgiveness, Penitent Engines charge towards enemy forces heedless of danger, knowing that only in death can forgiveness be earned.

The Penitent Engine is armed with a variety of immense melee and ranged weapons. Armaments can include twin [[Heavy Flamer]]s and , large [[Chainfist]]s, one and circular saws mounted on each fist.{{Fn|7b}} Some configurations feature a flamer slung over a [[Chainblade]].{{Fn|7a}} The Engines hurl out vicious streamers of each on both armsflame, which can explode in promethium-laced clouds among the enemy. {{Fn|7a}} ==Variants==Penitent Engines piloted by [[Sisters Repentia]] modified to wield heavier firepower are known as [[Mortifier]]s{{Fn|3}}